1995-02-01

Automotive Engine Modeling for Real-Time Control Using MATLAB/SIMULINK 950417

The use of graphical dynamic system simulation software is becoming more popular as automotive engineers strive to reduce the time to develop new control systems. The use of model-based control methods designed to meet future emission and diagnostic regulations has also increased the need for validated engine models. A previously validated, nonlinear, mean-torque predictive engine model* is converted to MATLAB / SIMULINK to illustrate the benefits of a graphical simulation environment. The model simulates a port-fuel-injected, spark-ignition engine and includes air, fuel and EGR dynamics in the intake manifold as well as the process delays inherent in a four-stroke cycle engine. The engine model can he used in five ways:
  • As a nonreal-time engine model for testing engine control algorithms
  • As a real-time engine model for hardware-in-the-loop testing
  • As an embedded model within a control algorithm or observer
  • As a system model for evaluating engine sensor and actuator models
  • As a subsystem in a powertrain or vehicle dynamics model
Although developed and validated for a specific engine, the model is generic enough to be used for a wide range of spark-ignition engines. Modular programming techniques reduce model complexity by dividing the engine and control system into hierarchical subsystems.

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